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In this section, you will learn about LabVIEW debugging techniques.

If a VI does not run, it is a broken, or nonexecutable, VI. The Run button often appears broken, shown at left, when you create or edit a VI. If it is still broken when youfinish wiring the block diagram, the VI is broken and will not run. Generally, this means that a required input is not wired,or a wire is broken.

Finding errors

Click the broken Run button or select Windows>>Show Error List to display the Error list window, which lists all the errors. Double-click an error description to display therelevant block diagram or front panel and highlight the object that contains the error.

Execution highlighting

View an animation of the execution of the block diagram byclicking the Highlight Execution button, shown in . Execution highlighting shows the flow of data on the block diagram from one node to anotherusing bubbles that move along the wires. Use execution highlighting in conjunction with single-stepping to see howdata move from node to node through a VI.

Execution highlighting greatly reduces the speed at which the VI runs.


Single-step through a VI to view each action of the VI on the block diagram as the VI runs. The single-steppingbuttons affect execution only in a VI or subVI in single-step mode. Enter single-step mode by clicking the Step Over or Step Into button. Move the cursor over the Step Over , Step Into , or Step Out button to view a tip strip that describes the next step if you clickthat button. You can single-step through subVIs or run them normally.

If you single-step through a VI with execution highlighting on, anexecution glyph, shown in , appears on the icons of the subVIs that are currently running.


Use the Probe tool, shown in , to check intermediate values on a wire as a VFI runs. Whenexecution pauses at a node because of single-stepping or a breakpoint, you also can probe the wire that just executedto see the value that flowed through that wire.

You also can create a custom probe to specify which indicator you use to view the probed data. For example, ifyou are viewing numeric data, you can choose to see that data in a chart within the probe. To create a custom probe,right-click a wire and select Custom Probe>>New from the shortcut menu.


Use the Breakpoint tool, shown in , to place a breakpoint on a VI, node, or wire on the block diagram and pause execution at thatlocatiFon. When you set a breakpoint on a wire, execution pauses after data pass through the wire. Place a breakpointon the block diagram workspace to pause execution after all nodes on the block diagram execute. When a VI pauses at abreakpoint, LabVIEW brings the block diagram to the front and uses a marquee to highlight the node or wire thatcontains the breakpoint. LabVIEW highlights breakpoints with red borders for nodes and block diagrams and red bullets forwires. When you move the cursor over an existing breakpoint, the black area of the Breakpoint tool cursor appears white. Use the Breakpoint tool to click an existing breakpoint to remove it.

Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Labview graphical programming. OpenStax CNX. Apr 09, 2015 Download for free at https://legacy.cnx.org/content/col11408/1.2
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